| Acronym | Definition |
|---|
| XIS | Xploring Inner Space |
| XIS | Extensible Information Server |
| XIS | Xerox Imaging Systems |
| XIS | Xtreme Internet Solutions |
| XIS | X-ray Imaging Spectrometer |
| XIS | Xerox Imaging Systems (now Nuance Communications; Burlington, MA) |
| XIS | Xiamen International School (China) |
| XIS | Extensible Information Systems (Polexis, Inc.) |
| XIS | XML Integration Services |
| XIS | X-ray Isochromat Spectroscopy |
| XIS | Xenon Infrared Searchlight |
| XIS | XACCT Interface Server (XACCT) |
| XIS | XML (Extensible Markup Language) Intranet System (software) |
| XIS | Xapakdy Integrations Systems (York, PA) |
| XIS | Xtranet Internet Services (South Africa) |